AIEEE 2011 PYQ Mock Test

A Carnot engine operating between temperatures $T_1$ and $T_2$ has efficiency $\frac{1}{6}$. When $T_2$ is lowered by $62\text{K}$, its efficiency increases to $\frac{1}{3}$. Then $T_1$ and $T_2$ are, respectively:

If a wire is stretched to make it $0.1\%$ longer, its resistance will:

Statement-1 : When light reflects from the air-glass plate interface, the reflected wave suffers a phase change of $\pi$.Statement-2 : The centre of the interference pattern in Newton's rings is dark.

A car is fitted with a convex side-view mirror of focal length $20\text{cm}$. A second car $2.8\text{m}$ behind the first car is overtaking the first car at relative speed of $15\text{m/s}$. The speed of the image of the second car as seen in the mirror of the first one is:

Energy required for the electron excitation in ${\text{Li}}^{++}$ from the first to the third Bohr orbit is: